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<FONT color="green">001</FONT>    /*<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
<FONT color="green">003</FONT>     * contributor license agreements.  See the NOTICE file distributed with<a name="line.3"></a>
<FONT color="green">004</FONT>     * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<FONT color="green">005</FONT>     * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a>
<FONT color="green">006</FONT>     * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<FONT color="green">007</FONT>     * the License.  You may obtain a copy of the License at<a name="line.7"></a>
<FONT color="green">008</FONT>     *<a name="line.8"></a>
<FONT color="green">009</FONT>     *     http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<FONT color="green">010</FONT>     *<a name="line.10"></a>
<FONT color="green">011</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<FONT color="green">012</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<FONT color="green">013</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<FONT color="green">014</FONT>     * See the License for the specific language governing permissions and<a name="line.14"></a>
<FONT color="green">015</FONT>     * limitations under the License.<a name="line.15"></a>
<FONT color="green">016</FONT>     */<a name="line.16"></a>
<FONT color="green">017</FONT>    package org.apache.commons.jxpath;<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    import java.util.Date;<a name="line.19"></a>
<FONT color="green">020</FONT>    import java.util.Map;<a name="line.20"></a>
<FONT color="green">021</FONT>    import java.util.HashMap;<a name="line.21"></a>
<FONT color="green">022</FONT>    <a name="line.22"></a>
<FONT color="green">023</FONT>    /**<a name="line.23"></a>
<FONT color="green">024</FONT>     * JXPathIntrospector  maintains a registry of {@link JXPathBeanInfo<a name="line.24"></a>
<FONT color="green">025</FONT>     * JXPathBeanInfo} objects for Java classes.<a name="line.25"></a>
<FONT color="green">026</FONT>     *<a name="line.26"></a>
<FONT color="green">027</FONT>     * @author Dmitri Plotnikov<a name="line.27"></a>
<FONT color="green">028</FONT>     * @version $Revision: 670727 $ $Date: 2008-06-23 15:10:38 -0500 (Mon, 23 Jun 2008) $<a name="line.28"></a>
<FONT color="green">029</FONT>     */<a name="line.29"></a>
<FONT color="green">030</FONT>    public class JXPathIntrospector {<a name="line.30"></a>
<FONT color="green">031</FONT>    <a name="line.31"></a>
<FONT color="green">032</FONT>        private static HashMap byClass = new HashMap();<a name="line.32"></a>
<FONT color="green">033</FONT>        private static HashMap byInterface = new HashMap();<a name="line.33"></a>
<FONT color="green">034</FONT>    <a name="line.34"></a>
<FONT color="green">035</FONT>        static {<a name="line.35"></a>
<FONT color="green">036</FONT>            registerAtomicClass(Class.class);<a name="line.36"></a>
<FONT color="green">037</FONT>            registerAtomicClass(Boolean.TYPE);<a name="line.37"></a>
<FONT color="green">038</FONT>            registerAtomicClass(Boolean.class);<a name="line.38"></a>
<FONT color="green">039</FONT>            registerAtomicClass(Byte.TYPE);<a name="line.39"></a>
<FONT color="green">040</FONT>            registerAtomicClass(Byte.class);<a name="line.40"></a>
<FONT color="green">041</FONT>            registerAtomicClass(Character.TYPE);<a name="line.41"></a>
<FONT color="green">042</FONT>            registerAtomicClass(Character.class);<a name="line.42"></a>
<FONT color="green">043</FONT>            registerAtomicClass(Short.TYPE);<a name="line.43"></a>
<FONT color="green">044</FONT>            registerAtomicClass(Short.class);<a name="line.44"></a>
<FONT color="green">045</FONT>            registerAtomicClass(Integer.TYPE);<a name="line.45"></a>
<FONT color="green">046</FONT>            registerAtomicClass(Integer.class);<a name="line.46"></a>
<FONT color="green">047</FONT>            registerAtomicClass(Long.TYPE);<a name="line.47"></a>
<FONT color="green">048</FONT>            registerAtomicClass(Long.class);<a name="line.48"></a>
<FONT color="green">049</FONT>            registerAtomicClass(Float.TYPE);<a name="line.49"></a>
<FONT color="green">050</FONT>            registerAtomicClass(Float.class);<a name="line.50"></a>
<FONT color="green">051</FONT>            registerAtomicClass(Double.TYPE);<a name="line.51"></a>
<FONT color="green">052</FONT>            registerAtomicClass(Double.class);<a name="line.52"></a>
<FONT color="green">053</FONT>            registerAtomicClass(String.class);<a name="line.53"></a>
<FONT color="green">054</FONT>            registerAtomicClass(Date.class);<a name="line.54"></a>
<FONT color="green">055</FONT>            registerAtomicClass(java.sql.Date.class);<a name="line.55"></a>
<FONT color="green">056</FONT>            registerAtomicClass(java.sql.Time.class);<a name="line.56"></a>
<FONT color="green">057</FONT>            registerAtomicClass(java.sql.Timestamp.class);<a name="line.57"></a>
<FONT color="green">058</FONT>    <a name="line.58"></a>
<FONT color="green">059</FONT>            registerDynamicClass(Map.class, MapDynamicPropertyHandler.class);<a name="line.59"></a>
<FONT color="green">060</FONT>        }<a name="line.60"></a>
<FONT color="green">061</FONT>    <a name="line.61"></a>
<FONT color="green">062</FONT>        /**<a name="line.62"></a>
<FONT color="green">063</FONT>         * Automatically creates and registers a JXPathBeanInfo object<a name="line.63"></a>
<FONT color="green">064</FONT>         * for the specified class. That object returns true to isAtomic().<a name="line.64"></a>
<FONT color="green">065</FONT>         * @param beanClass to register<a name="line.65"></a>
<FONT color="green">066</FONT>         */<a name="line.66"></a>
<FONT color="green">067</FONT>        public static void registerAtomicClass(Class beanClass) {<a name="line.67"></a>
<FONT color="green">068</FONT>            byClass.put(beanClass, new JXPathBasicBeanInfo(beanClass, true));<a name="line.68"></a>
<FONT color="green">069</FONT>        }<a name="line.69"></a>
<FONT color="green">070</FONT>    <a name="line.70"></a>
<FONT color="green">071</FONT>        /**<a name="line.71"></a>
<FONT color="green">072</FONT>         * Automatically creates and registers a {@link JXPathBeanInfo} object<a name="line.72"></a>
<FONT color="green">073</FONT>         * for the specified class. That object returns true to<a name="line.73"></a>
<FONT color="green">074</FONT>         * {@link JXPathBeanInfo#isDynamic()}.<a name="line.74"></a>
<FONT color="green">075</FONT>         *<a name="line.75"></a>
<FONT color="green">076</FONT>         * @param beanClass to register<a name="line.76"></a>
<FONT color="green">077</FONT>         * @param dynamicPropertyHandlerClass to handle beanClass<a name="line.77"></a>
<FONT color="green">078</FONT>         */<a name="line.78"></a>
<FONT color="green">079</FONT>        public static void registerDynamicClass(Class beanClass,<a name="line.79"></a>
<FONT color="green">080</FONT>                Class dynamicPropertyHandlerClass) {<a name="line.80"></a>
<FONT color="green">081</FONT>            JXPathBasicBeanInfo bi =<a name="line.81"></a>
<FONT color="green">082</FONT>                new JXPathBasicBeanInfo(beanClass, dynamicPropertyHandlerClass);<a name="line.82"></a>
<FONT color="green">083</FONT>            if (beanClass.isInterface()) {<a name="line.83"></a>
<FONT color="green">084</FONT>                byInterface.put(beanClass, bi);<a name="line.84"></a>
<FONT color="green">085</FONT>            }<a name="line.85"></a>
<FONT color="green">086</FONT>            else {<a name="line.86"></a>
<FONT color="green">087</FONT>                byClass.put(beanClass, bi);<a name="line.87"></a>
<FONT color="green">088</FONT>            }<a name="line.88"></a>
<FONT color="green">089</FONT>        }<a name="line.89"></a>
<FONT color="green">090</FONT>    <a name="line.90"></a>
<FONT color="green">091</FONT>        /**<a name="line.91"></a>
<FONT color="green">092</FONT>         * Creates and registers a JXPathBeanInfo object for the supplied class. If<a name="line.92"></a>
<FONT color="green">093</FONT>         * the class has already been registered, returns the registered<a name="line.93"></a>
<FONT color="green">094</FONT>         * JXPathBeanInfo object.<a name="line.94"></a>
<FONT color="green">095</FONT>         * &lt;p&gt;<a name="line.95"></a>
<FONT color="green">096</FONT>         * The process of creation of JXPathBeanInfo is as follows:<a name="line.96"></a>
<FONT color="green">097</FONT>         * &lt;ul&gt;<a name="line.97"></a>
<FONT color="green">098</FONT>         * &lt;li&gt;If class named &lt;code&gt;&amp;lt;beanClass&amp;gt;XBeanInfo&lt;/code&gt; exists,<a name="line.98"></a>
<FONT color="green">099</FONT>         *     an instance of that class is allocated.<a name="line.99"></a>
<FONT color="green">100</FONT>         * &lt;li&gt;Otherwise, an instance of {@link JXPathBasicBeanInfo<a name="line.100"></a>
<FONT color="green">101</FONT>         *     JXPathBasicBeanInfo}  is allocated.<a name="line.101"></a>
<FONT color="green">102</FONT>         * &lt;/ul&gt;<a name="line.102"></a>
<FONT color="green">103</FONT>         * @param beanClass whose info to get<a name="line.103"></a>
<FONT color="green">104</FONT>         * @return JXPathBeanInfo<a name="line.104"></a>
<FONT color="green">105</FONT>         */<a name="line.105"></a>
<FONT color="green">106</FONT>        public static JXPathBeanInfo getBeanInfo(Class beanClass) {<a name="line.106"></a>
<FONT color="green">107</FONT>            JXPathBeanInfo beanInfo = (JXPathBeanInfo) byClass.get(beanClass);<a name="line.107"></a>
<FONT color="green">108</FONT>            if (beanInfo == null) {<a name="line.108"></a>
<FONT color="green">109</FONT>                beanInfo = findDynamicBeanInfo(beanClass);<a name="line.109"></a>
<FONT color="green">110</FONT>                if (beanInfo == null) {<a name="line.110"></a>
<FONT color="green">111</FONT>                    beanInfo = findInformant(beanClass);<a name="line.111"></a>
<FONT color="green">112</FONT>                    if (beanInfo == null) {<a name="line.112"></a>
<FONT color="green">113</FONT>                        beanInfo = new JXPathBasicBeanInfo(beanClass);<a name="line.113"></a>
<FONT color="green">114</FONT>                    }<a name="line.114"></a>
<FONT color="green">115</FONT>                }<a name="line.115"></a>
<FONT color="green">116</FONT>                byClass.put(beanClass, beanInfo);<a name="line.116"></a>
<FONT color="green">117</FONT>            }<a name="line.117"></a>
<FONT color="green">118</FONT>            return beanInfo;<a name="line.118"></a>
<FONT color="green">119</FONT>        }<a name="line.119"></a>
<FONT color="green">120</FONT>    <a name="line.120"></a>
<FONT color="green">121</FONT>        /**<a name="line.121"></a>
<FONT color="green">122</FONT>         * Find a dynamic bean info if available for any superclasses or<a name="line.122"></a>
<FONT color="green">123</FONT>         * interfaces.<a name="line.123"></a>
<FONT color="green">124</FONT>         * @param beanClass to search for<a name="line.124"></a>
<FONT color="green">125</FONT>         * @return JXPathBeanInfo<a name="line.125"></a>
<FONT color="green">126</FONT>         */<a name="line.126"></a>
<FONT color="green">127</FONT>        private static JXPathBeanInfo findDynamicBeanInfo(Class beanClass) {<a name="line.127"></a>
<FONT color="green">128</FONT>            JXPathBeanInfo beanInfo = null;<a name="line.128"></a>
<FONT color="green">129</FONT>            if (beanClass.isInterface()) {<a name="line.129"></a>
<FONT color="green">130</FONT>                beanInfo = (JXPathBeanInfo) byInterface.get(beanClass);<a name="line.130"></a>
<FONT color="green">131</FONT>                if (beanInfo != null &amp;&amp; beanInfo.isDynamic()) {<a name="line.131"></a>
<FONT color="green">132</FONT>                    return beanInfo;<a name="line.132"></a>
<FONT color="green">133</FONT>                }<a name="line.133"></a>
<FONT color="green">134</FONT>            }<a name="line.134"></a>
<FONT color="green">135</FONT>    <a name="line.135"></a>
<FONT color="green">136</FONT>            Class[] interfaces = beanClass.getInterfaces();<a name="line.136"></a>
<FONT color="green">137</FONT>            if (interfaces != null) {<a name="line.137"></a>
<FONT color="green">138</FONT>                for (int i = 0; i &lt; interfaces.length; i++) {<a name="line.138"></a>
<FONT color="green">139</FONT>                    beanInfo = findDynamicBeanInfo(interfaces[i]);<a name="line.139"></a>
<FONT color="green">140</FONT>                    if (beanInfo != null &amp;&amp; beanInfo.isDynamic()) {<a name="line.140"></a>
<FONT color="green">141</FONT>                        return beanInfo;<a name="line.141"></a>
<FONT color="green">142</FONT>                    }<a name="line.142"></a>
<FONT color="green">143</FONT>                }<a name="line.143"></a>
<FONT color="green">144</FONT>            }<a name="line.144"></a>
<FONT color="green">145</FONT>    <a name="line.145"></a>
<FONT color="green">146</FONT>            Class sup = beanClass.getSuperclass();<a name="line.146"></a>
<FONT color="green">147</FONT>            if (sup != null) {<a name="line.147"></a>
<FONT color="green">148</FONT>                beanInfo = (JXPathBeanInfo) byClass.get(sup);<a name="line.148"></a>
<FONT color="green">149</FONT>                if (beanInfo != null &amp;&amp; beanInfo.isDynamic()) {<a name="line.149"></a>
<FONT color="green">150</FONT>                    return beanInfo;<a name="line.150"></a>
<FONT color="green">151</FONT>                }<a name="line.151"></a>
<FONT color="green">152</FONT>                return findDynamicBeanInfo(sup);<a name="line.152"></a>
<FONT color="green">153</FONT>            }<a name="line.153"></a>
<FONT color="green">154</FONT>            return null;<a name="line.154"></a>
<FONT color="green">155</FONT>        }<a name="line.155"></a>
<FONT color="green">156</FONT>    <a name="line.156"></a>
<FONT color="green">157</FONT>        /**<a name="line.157"></a>
<FONT color="green">158</FONT>         * find a JXPathBeanInfo instance for the specified class.<a name="line.158"></a>
<FONT color="green">159</FONT>         * Similar to javax.beans property handler discovery; search for a<a name="line.159"></a>
<FONT color="green">160</FONT>         * class with "XBeanInfo" appended to beanClass.name, then check<a name="line.160"></a>
<FONT color="green">161</FONT>         * whether beanClass implements JXPathBeanInfo for itself.<a name="line.161"></a>
<FONT color="green">162</FONT>         * Invokes the default constructor for any class it finds.<a name="line.162"></a>
<FONT color="green">163</FONT>         * @param beanClass for which to look for an info provider<a name="line.163"></a>
<FONT color="green">164</FONT>         * @return JXPathBeanInfo instance or null if none found<a name="line.164"></a>
<FONT color="green">165</FONT>         */<a name="line.165"></a>
<FONT color="green">166</FONT>        private static synchronized JXPathBeanInfo findInformant(Class beanClass) {<a name="line.166"></a>
<FONT color="green">167</FONT>            String name = beanClass.getName() + "XBeanInfo";<a name="line.167"></a>
<FONT color="green">168</FONT>            try {<a name="line.168"></a>
<FONT color="green">169</FONT>                return (JXPathBeanInfo) instantiate(beanClass, name);<a name="line.169"></a>
<FONT color="green">170</FONT>            }<a name="line.170"></a>
<FONT color="green">171</FONT>            catch (Exception ex) { //NOPMD<a name="line.171"></a>
<FONT color="green">172</FONT>                // Just drop through<a name="line.172"></a>
<FONT color="green">173</FONT>            }<a name="line.173"></a>
<FONT color="green">174</FONT>    <a name="line.174"></a>
<FONT color="green">175</FONT>            // Now try checking if the bean is its own JXPathBeanInfo.<a name="line.175"></a>
<FONT color="green">176</FONT>            try {<a name="line.176"></a>
<FONT color="green">177</FONT>                if (JXPathBeanInfo.class.isAssignableFrom(beanClass)) {<a name="line.177"></a>
<FONT color="green">178</FONT>                    return (JXPathBeanInfo) beanClass.newInstance();<a name="line.178"></a>
<FONT color="green">179</FONT>                }<a name="line.179"></a>
<FONT color="green">180</FONT>            }<a name="line.180"></a>
<FONT color="green">181</FONT>            catch (Exception ex) { //NOPMD<a name="line.181"></a>
<FONT color="green">182</FONT>                // Just drop through<a name="line.182"></a>
<FONT color="green">183</FONT>            }<a name="line.183"></a>
<FONT color="green">184</FONT>    <a name="line.184"></a>
<FONT color="green">185</FONT>            return null;<a name="line.185"></a>
<FONT color="green">186</FONT>        }<a name="line.186"></a>
<FONT color="green">187</FONT>    <a name="line.187"></a>
<FONT color="green">188</FONT>        /**<a name="line.188"></a>
<FONT color="green">189</FONT>         * Try to create an instance of a named class.<a name="line.189"></a>
<FONT color="green">190</FONT>         * First try the classloader of "sibling", then try the system<a name="line.190"></a>
<FONT color="green">191</FONT>         * classloader.<a name="line.191"></a>
<FONT color="green">192</FONT>         * @param sibling Class<a name="line.192"></a>
<FONT color="green">193</FONT>         * @param className to instantiate<a name="line.193"></a>
<FONT color="green">194</FONT>         * @return new Object<a name="line.194"></a>
<FONT color="green">195</FONT>         * @throws Exception if instantiation fails<a name="line.195"></a>
<FONT color="green">196</FONT>         */<a name="line.196"></a>
<FONT color="green">197</FONT>        private static Object instantiate(Class sibling, String className)<a name="line.197"></a>
<FONT color="green">198</FONT>                throws Exception {<a name="line.198"></a>
<FONT color="green">199</FONT>    <a name="line.199"></a>
<FONT color="green">200</FONT>            // First check with sibling's classloader (if any).<a name="line.200"></a>
<FONT color="green">201</FONT>            ClassLoader cl = sibling.getClassLoader();<a name="line.201"></a>
<FONT color="green">202</FONT>            if (cl != null) {<a name="line.202"></a>
<FONT color="green">203</FONT>                try {<a name="line.203"></a>
<FONT color="green">204</FONT>                    Class cls = cl.loadClass(className);<a name="line.204"></a>
<FONT color="green">205</FONT>                    return cls.newInstance();<a name="line.205"></a>
<FONT color="green">206</FONT>                }<a name="line.206"></a>
<FONT color="green">207</FONT>                catch (Exception ex) { //NOPMD<a name="line.207"></a>
<FONT color="green">208</FONT>                    // Just drop through and try the system classloader.<a name="line.208"></a>
<FONT color="green">209</FONT>                }<a name="line.209"></a>
<FONT color="green">210</FONT>            }<a name="line.210"></a>
<FONT color="green">211</FONT>    <a name="line.211"></a>
<FONT color="green">212</FONT>            // Now try the bootstrap classloader.<a name="line.212"></a>
<FONT color="green">213</FONT>            Class cls = Class.forName(className);<a name="line.213"></a>
<FONT color="green">214</FONT>            return cls.newInstance();<a name="line.214"></a>
<FONT color="green">215</FONT>        }<a name="line.215"></a>
<FONT color="green">216</FONT>    }<a name="line.216"></a>




























































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